to achieve

Plug the front speaker cables into the Headphone-Out Jack.

assign HP pin as first pin in multi_outs and get 0x2 as dac which share
with speaker 0x14

assign two mio pins and share dac 0x03 and 0x04 with speaker 0x15 and
0x16

assign line out pin for side channel


either 

http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=f811c3cf8fae63ecc8a937ba7376490e2565f8f1

-               spec->gen.add_out_jack_modes = 1;
+               spec->gen.add_jack_modes = 1;

create the headphone Jack mode to switch HP pin as HP or line out
 

or

use a switch to change HP to use 0x25 for headphone playback volume and
use 0x02 front volume for extvernal speaker


multi_outs = 1b/0/0/17 : 2/3/4/5 
   out_path: depth=3 :02:0c:1b
   out path: depth=3 :05:0f:17
 multi_ios(2) = 1a/18 : 2/3
   mio path: depth=3 :03:0d:1a
   mio path: depth=3 :04:0e:18

 hp_outs = 1b/0/0/0 : 25/0/0/0
   hp path: depth=3 :25:26:1b

spk_outs = 14/16/15/0 : 2/4/3/0
   spk path: depth=3 :02:0c:14
   spk path: depth=3 :04:0e:16
   spk path: depth=3 :03:0d:15

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https://bugs.launchpad.net/bugs/1236965

Title:
  pulseaudio does not recognize internal speakers [P180HMx, Realtek
  ALC892, Speaker, Internal] volume slider problem

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